What is a multi tapped motor

Purpose of a summer/winter switch on burner and supply fan

What is the purpose of a summer/wimter switch which control a burner and supply fan

Since the cooled air is heavier, some units run the RPM up in Air and lower in Winter since the heated air is less dense.

Normally the "summer" setting will run the fan all the time. Mobile Home?

Multi tapped is another term for multi speed.